Universal stoneworking-machine.



0. BAUER.

UNIVERSAL STONEWORKING MACHINE.

APPLICATION man ocT. 2o, 1914.

Patented Jul-y 13, 1915.

2 SHEETS-SHEET l.

CDLUMBIA PLANOURAPH Co.. WASHINGTON, D, C.

0. BAUER.

UNIVERSAL STONEWORKING MACHINE.

. WNNIII I I I III|III @EMM m APPLICATION FILED OCT. 20. 1914.

QN QQ ORA/Hs emrah estaras rarest ergeren.

OEKAR` BAUER, OF NEW YORK, N. Y.

UNIVERSAL STONEWORKING-T/IACHN E.

Specification of Letters Patent. Patented July 13, 1915.

.Application led October 20, 1914. Serial No. 867,578.

lapidaries or stone workers, and has particular reference to machines for grinding irregular surfacesin a preciserk and uniform manner irrespective of the number of pieces to be made or finished.

Among the objects of the invention, therefore, is to provide a universally movable support for a grinding wheel, the same bcing adapted to be operated at a high rate of speed from any source of power, and a means coperating` therewith to cause the grinding wheel to follow any desired outline to which the work isv to be finished.

rllhe foregoing and other objects of the invention will hereinafter be more fully described and claimed and illustrated in the drawings forming a part of this specication in which like characters of reference indicate corresponding parts in all the views, and in which- Figure 1 is a side elevation of a preferred embodiment of the invention, parts being in section; Fig. 2 is a plan view of the same; Figs. 3 and 4 are horizontal sectional details on the correspondinglines of Fig. 1; Fig. 5 is a vertical sectional detail on the line 5-5 of Fig. 2; Fig. 6 is a detail plan view of an adjustment mechanism for the guide member; Fig. 7 is an end view of the same looking toward the left in Fig. 8; Fig. 8 is a vertical section on the line 8 8 of Fig. G; and Fig. 9 is a vertical section on the line 9--9 of Fig. 2.

rlhe several parts of the device may be made of any suitable materials, and the rela- `tive sizes and proportions, as well as the general design of the mechanism, may be varied to a considerable extent without departing from the spirit of the invention hereinafter more fully described and specifically claimed.

At 10 l show a work table of any suitable construction and secured therein is a vertical nut 1l having an internal thread.

At 12 I provide a bracket through which iva bar 13 of rectangular cross section is slidably fitted for movement in horizontal planes or in parallelism with respect to the table. I show a horizontal frame F, shown best in Fig. 2, the same being substantially semicircular in form above the center of which the aforesaid bracket 12 is supported, the bracket `being adapted to rotate around the aXis of said horizontal frame F. 14 indicates a main supporting and adjusting screw located within said nut 1l and aroundthe axis of whichl the bracket 412 is adapted to swing; Said screw has connected to it a gear 15 meshingfwith a pinionl@ secured upon the lower end of a vertical shaft 17 journaled in a bearing 18 at one side of the bracket 12." The bar 13 is provided with any suitable form of handle 19 at either end whereby the operator may either swing the bar around the vertical axis of the screw 14 and frame F, or push it longitudinally through the bracket 12 in either direction.

The grinding wheel 20 is secured in the lower end of the power shaft 21 adapted to be rotated at high speed from an electric'or air motor mounted upon the upper end of the shaft and not shown, or by means of belts or pulleys of yany suitable distant power. "Said shaft 21 is journaled in a bearing 22 adjacent one end of the bar 13, and extending laterally from said bar on opposite sides of the bearing 22 are bearings 23 in which a countershaft 24 is journaled parallel to the bar 13. Said countershaft is held'froin longitudinal movement independently of the bar by means of collars 25 or other suitable means cooperating with the bearings Between the bearings a worm wheel 26 is secured to the count-ershaft and is in constant mesh with the worm 27 secured rigidly to the power shaft 21. It will lil() the sleeve extends and providing for free slidable movement ofy the countershaft or f the sleeve independently of each other and for the rotation of the sleeve from said countershaft. The countershaft and sleeve accordingly are operated continuously when the machine is in operation.y A pair of pinions 31 are secured to the sleeve on opposite sides ofthe axis of the shaft 17 and the gear 32 carried by the upper end of the shaft 17 lies between said pinions and is adapted to be out of contact with both of them or in mesh with either of them, depending upon -the position of the sleeve which is adapted to be reciprocated in its bearings 29 by means of a lever 33 pivoted at its lower end to the bracket at 34 and embracing a collar 35 secured to the sleeve. When the lever is in the neutral position shown in Fig. 1, the gear 32y is out of contact with the pinions 31 and the shaft 17 is hence idle. lVhen, however, the lever is shifted to either ofthe dotted line positions, the corresponding pinionA 31 will be made to engage and drive the gear 32 causing the rotation of thepinion 16, gear 15 and screw 14 land hence ythe corresponding up or down adjustment of thevframe F, bracket 12, bar 13 and grinding wheel.` In addition to the parts already described, I may use one or more rbraces 36 connected at 37 to the frame F and slidable through clamps 38 connected to the table 10, each of said braces 36 being adapted to be set in adjusted position for steadying the mechanism by means of a clamping screw The frame F is shown provided with a series of radial slots40 and 41, the slots 40 being longer than theothers and arranged in alternation therewith. The purpose of these slots is lto provide means for adjusting and holding in any desired adjusted position or 4form a flexible metallic guide 42, the same having coperation with the oper ating bar 13 for reproducing any desired number of uniform shapes or pieces of work. The means l prefer to employ for adjusting and locking the guide strip 42 is shown particularly in Figs. 6, 7 and 8, the same comprising a block 43 for each of the slots, the same being adjustable longitudinally thereof and hence toward or from the center of the frame by means of a screw 44 having a polygonal outer end or head 45 for the application of a suitable key or wrench 46. Each of the blocks 43 is made preferably in two parts which meet within the slot and secured together by means of a screw or bolt 47. This screw 47 serves not only, therefore, to connect the two parts of the blocks'together, providing an easy manner of assemblage, butl also may be used as a means for truing the guide strip or parts associated therewith. The upper portion of the block is provided with a cylindrical bearing 48 in which two substantially semicylindrical bearing blocks 4Q are journaled for rotation around a vertical axis, said axis being shown as coincident with the .axis of the screw 47. These bearing blocks are spaced from each other far enough to receive the guide 42 between them and the and is adjustable by means of a screw 51 1n order to provide the'desired tension be tween the bearing blocks and the guide. As shown in Figs. 7 and 8, the guide extends above the severaladjusting devices, anda shoe 52 of any suitable nature carried by a holder 53 coperateswith the upper edge of the guide whereby the bar13 to which the holder is adjustably clamped is directed according to the work to be done. is preferably of the form shown in Fig. 5, being extended into a socket 54 against a spring and held from displacement by means of a pin 56. The shoe is provided with a notch 52 into which the guide extends.

The operation yof the machine may be briefiy set forth as follows in view of the preceding description of the parts.: Vhen a number of similar pieces of work of uniform shape are to be made or finished, the operator will use a form or pattern shown at W corresponding to the shape desired to be made. The holder 53 being locked at any convenient point alongl the bar, the grinding wheel 2Oy will be moved along the pattern from one end to theother, and while it is being so moved step by step, and the bar is rotated in a horizontal plane around the axis of the screw 14, the several blocks 43 will be adjusted along the slots 40 and 41 at uniform distances from the corresponding points of the pattern opposite and through said screw axis.v In other words, the length of the bar measured from the axis of the shoe 52 through the axis of the screw 14 to the point of contact between the grinding wheel and work 1V is always the same so long as the holder 53 remains xed at the same point upon the bar. The several positions, ther fore, of the grinding wheel along the pattern or work, the bar 13 swinging around its vertical axis, will determine the points at which the several blocks 43 must be set so as to fix the flexible metallic guide 42 in definite position to reproduce any desired number of pieces of work of uniform shape. For the manipulation of the bar 13, the operator may operate either handle 19 as may be found most desirable.' Usually,

he shoe however, Iprefer to manipulate the bar from the end adjacent 'the grinding wheel in making the first piece as, for instance, in cutting a. block of stone or marble to a certain outline marked thereon, whilef subse'- to oifset any tendency of the bracket to bind upon the pivot provided by the screw 14.

Access is had to the screw 5T through a hole 5S in the top of the bracket, the bary 13 being removed for this purpose. kAs shown in Fig. 2, l employ a 'set s'crewilfor lock- -ing the bar from longitudinal movement through the bracket, which is desirable `at times as, for instance, 'when desiring to operate the grinding wheel inthe arcof a circle. I also employ a set screw 60 operating `through the bracket 12v and serving to lock said bracket from rotation upon the screw. ln other words, by setting the screw 60 I may rotate the screw to hoist or lower the same and the bracket by power applied through the bar 13 directly.

The term grinding as used herein is to be interpreted in its usualmeaning in' stone.y

working or stone cutting establishments, having referenceto the euttingor the shaping of the stone as distinguished from the finishing or polishing of a previously formed surface. f

In the practice of this invention the grinding or cutting wheel is operated at a high speed of from twenty-three hundred to twenty-live hundred revolutions per minute, and because of such high speedand the fact that the wheel itself maybe of twelve to fifteen inches in'diameter and of considerable weight, it `is essential that it be secured to a rigid shaft in order to prevent gyrating or wabbling.

I am aware that polishing machines have been proposed heretofore having some of the characteristics of my invention, but, so far as l have observed, the polishing tool in all cases is adapted to operate'against a Hat surface perpendicularlyfto the axisof the tool and with the tool connected to its shaft by a pivot or universal joint. Hence, such* previous machines are by no means adapted for cutting irregular or molded surfaces and especially in which the cutting or grinding action takes place on the edge or periphery of the grinding wheel having a surface precisely complemental to the surface to be formed.

I claim:

1. The combination of a vertical support,

handle opposite the `grinding a. bracket carried-'by said support, a bar carriedl'by vsaid `bracket Aand movable therewith around the vertical axis of said support and slidable iny horizontal directions through the bracket, a grinding wheel journaled in a fixed bearing in said bar and carried therel by during all adjustments of the bar, a horizontal frame, a flexible guide member alllgidfbwe and in a planeparallelto saidy frame, means to fix the guide member` to the frame in `any desired rshapewithin the plane ofthe guide member, and a shoe carried by the bar and cooperating with said.,r guide member, substantiallyr as set forth.

Inamachine of the character setforth, the combination of a support having Ia vertical axis, a semi-circular frame connectedl to and concentricy with said support, said frame having a series of radial slots, a bar supported above said support and movable around lthe axis thereof, means-to cause said support kto raise or lower the bar and frame, means to prevent rotation of the frame, said bar being slidable transversely of its axis of rotation, agrinding wheel carried by the bar on one side of its axis of rotation, a shoe carried by the bar on the other side of its axisfoffrotation above said frame,a flexible guide member with which said shoe `coperyates, and means to clamp the guide member to the" frame along said slots in various forms, substantially as and for the purposes set forth. i

8. .ln a stone working machine, the combination of a support having a fixed vertical axisa yframe connected with saidy support and lying in a plane perpendicular to 4 said` axis, said frame having a series of radial slots formed therein, a grinding wheel, a bar controlling the position of the grinding wheel and movable transversely of and also around said support axis, a guide shoe carried by the bar above the frame, a flexible afiguide member cooperating with said shoe,

and a series of blocks movable along said slots and holding said guide member in any desired form, substantially as set forth.

4. In a stone workingmachine, the combination of a support having an axis, a frame associated with the support and lying in a plane perpendicular to its axis, vmeans f to prevent rotation of the frame, a bar arranged oppositethe end of said support and slidable transversely of its axis and rotatable therearound in a plane parallel to the frame,V a grinding wheel supported in a fixed bearing in said bar, a guide shoe secured to the bar remote from the grinding wheel, a guide member between the bar and the frame along which said shoe is adapted to operate during the rotation of the bar, and means carried by the frame serving to fix the guide bar in any desired shape according tothe work to be performed by the grinding wheel, substantially as set forth.

yto

v5. The combination with a table anda nut fixedl therein, a rotary supporting screwjournaled `in said nut and having a yvertical axis, a semi-circular frame embracing said screw lying ina plane parallel to the table, means acting between the frame` and the table to prevent rotation of the frame, a grinding wheel above the table, a bar supported labove the screw and movable around ythe axis thereof, means supporting theV` grinding wheel upon the bar, said `bar and grinding vwheel being shiftable in lines perpendicular to the axis of the screw, a guide member above the frame, means to adjust the [guide memberin any desired shape in a plane parallel to the frame, a guide shoe carried by the .bar coperating with said guide member, the distance between the centers of the wheel and the guide shoe remaining constant duringthe complete operation of the machine von any number of similar pieces of work, and means operated directly from the grinding wheel shaft to cause rotation of the supporting screw for vertical adjustments of the grinding wheel and frame.

6. The combination of a vertical supporting screw, a grinding Wheel having a shaft parallel to said screw, a bar having a bearing in which said grinding shaft is journaled,

- said bar being supported above the screw and movable around the axis thereof and alsoy slidable transversely of said axis, a

worm surrounding and secured to the grinding screw, a power shaft parallel thereto,` a

grinding wheel carried by the power shaft, a bar above the screw and movable around the axis thereof and also slidable perpendicularly to said axis, said bar having a bearing in which said power shaft is journaled, a countershaft carried in fixed position'with respect to the bar and movable therewith,

means to drive the 'countershaft ldirectly from the power shaft, a sleeve slidable upon the countershaft, a pair of pinions secured to the sleeve in spaced relation to each other, av gear located between said pinions and adapted to be free therefrom or to mesh with either of them, a shaft carrying said gear and parallel to the screw, and constantly meshing gear members connected to the shaft and screw respectively whereby the screw is adapted to be rotated `in either direction to raise and `lower the bar and grinding wheel from said countershaft irrespective of the relativey positions ofthe grinding wheeland screw, substantially as set forth.

8. The combination with a work table and a nut fixed therein, of a rotary supporting screw threaded in said nut through the table, said screw having a smooth cylindrical neckadjacent its upper end, a frameembracing said neck and arranged parallel to the table, means Y providing v for vertical movement of the frame but preventing the rotation thereof around the screw, a bracket swiveled to the upper end of the screw, a power shaft arranged vparallel to the'screw, a grinding wheel secured to the lower end of said shaft, a bar slidable in said bracket and rotatable therewith around the axis of the screw, said bar having said power shaft journaled therein, a countershaft extending f along. one side of the bracket parallel to the In testimony whereof I have signed yname to this specification in the presence of two subscribing witnesses.

y OSCAR BAUER. Witnesses: l

GEO. L. BEELER, PHILIP D. RoLLHAUs.

(lfopiesy of this patent may be obtained for ve cents each, by addressing' the Commissioner of Patents.

Washington, D. G3i A l 

